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Enhanced peroxynitrite decomposition protects against experimental obliterative bronchiolitis
Babu V Naidu1, Alexander S Farivar, Steven M Woolley
1Division of Cardiothoracic Surgery, Department of Surgery, University of Washington, Box 356310, 1959 NE Pacific St., Seattle, WA 98195, USA.
Experimental and Molecular Pathology
|July 2, 2003
Summary
Peroxynitrite contributes to obliterative bronchiolitis (OB) after lung transplantation. A peroxynitrite decomposition catalyst, FP-15, protected against OB development in a rat model, suggesting potential clinical utility.
Area of Science:
- Transplantation immunology
- Pulmonary medicine
- Oxidative stress research
Background:
- Obliterative bronchiolitis (OB) is a major complication in lung transplant survivors.
- The role of peroxynitrite in OB pathogenesis is not well understood.
- Oxidative stress is implicated in lung injury and inflammation.
Purpose of the Study:
- To investigate the role of peroxynitrite in experimental obliterative bronchiolitis.
- To evaluate the therapeutic potential of a peroxynitrite decomposition catalyst (FP-15) in preventing OB.
Main Methods:
- A rat model of tracheal transplantation was used to induce experimental OB.
- Animals received daily intraperitoneal injections of FP-15 or a placebo.
- Histopathological analysis and nitrotyrosine staining assessed airway injury and inflammation.
Main Results:
- Control allografts showed significant epithelial loss, inflammation, and airway obstruction (83% reduction in area).
- FP-15 treatment reduced nitrotyrosine formation, preserved respiratory epithelium, and limited inflammation.
- FP-15 treated rats experienced only a 14% reduction in airway cross-sectional area (P <.001).
Conclusions:
- Peroxynitrite appears to play a significant role in the development of obliterative bronchiolitis.
- The peroxynitrite decomposition catalyst FP-15 demonstrated protective effects against OB in this rat model.
- FP-15 warrants further investigation for its potential clinical application in preventing OB post-transplantation.